Question about 670hp combo in this months Hot rodding magazine

You might have power assist the first or second pump of the pedal, but a cam like that won't be too much fun in traffic. You can count on sacrificing some brake assist on repeated brake pumps with that kind of duration.

If you are serious about a motor at this level call these guys:
http://www.hydratechbraking.com/products/
they're coming out w/ a fox kit that would eliminate any worry about maintaining vaccum all together.

Yes i would say that that engine would need a vacuum pump in order to help with the brakes.